Fig. 3. Mediolateral contribution of the thoracic unilateral bisegmented clones. (A) Definition of the maximal mediolateral extension (MLE) in pooled segments of a bisegmented clone. Each white rectangle represents a segment and the closed circles are labelled cells. MB, medial border; LB, lateral border of the clone. (B-D) Mediolateral position of the labelled cells in the thoracic unilateral bisegmented clones. Each white rectangle represents a clone with its two labelled segments. The code of colours is the same as in Fig. 2. The clones are classified by their property of not crossing (B-C) or of crossing (D) the clonal separation at the middle of the segment. m, medial; l, lateral.